9
05.01
9.4 Application examples
9-375
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Siemens AG 2012 All Rights Reserved
SIMODRIVE 611 Configuration Manual (PJU) – 02/2012 Edition
Table 9-21
Determining MTTF
d
Parameter
Value
Comment
Channel 1
Safety relay –K1
B
10d
value
20.000.000
Manufacturer’s data
n
op
525612 per
year
525600 per year by the protective door + 12 per
year by EMERGENCY STOP
MTTF
d
(–K1)
951 Jahre
MTTF
d
=
B
10d
0,1 x n
op
Contactor relay –K6
B
10d
value
1.333.333
Manufacturer’s data
n
op
525612 per
year
525600 per year by the protective door + 12 per
year by EMERGENCY STOP
MTTF
d
(contactor
relay)
25,3 years
MTTF
d
=
B
10d
0,1 x n
op
Zwischenergebnis Kanal 1
MTTF
d
(channel 1)
21,8 years
MTTF
d
(channel 1)
1
MTTF
d
(–K1[–A11...–A16], –K6)
1
=
∑
Channel 2
Line contactor –K2 and contactor relay –K5
B
10d
value
1.333.333
Manufacturer’s data
n
op
12 per
year
12 actuations per year as a result of
EMERGENCY STOP
MTTF
d
(–K2)
1.111.111 years
MTTF
d
=
B
10d
0,1 x n
op
Contactor relays –K3, –K4
B
10d
value
1.333.333
Manufacturer’s data
n
op
525612 per
year
525600 per year by the protective door + 12 per
year by EMERGENCY STOP
MTTF
d
(contactor
relay)
25,3 years
MTTF
d
=
B
10d
0,1 x n
op
Intermediate result, channel 2
MTTF
d
(channel 2)
12,6 years
MTTF
d
(Kanal 1)
1
MTTF
d
(–K2, –K3, –K4, –K5)
1
=
∑
Intermediate result, RESPOND (channel 1 and 2)
MTTF
d
(RESPOND)
17,6 years
→
average
Symmetrization of both channels is not neces-
sary
MTTF
d
=
1
2
3
MTTF
d1
(channel 1) + MTTF
d
(channel 2)
–
1
MTTF
d
(channel 1)
1
MTTF
d
(channel 2)
+
Determining
MTTF
d
9 Cabinet Design and EMC
02.12